Intratendinous ganglion cyst of the extensor communis tendon of the index finger: a case report

Ganglion cysts are the most common benign soft tissue tumors of the hand and wrist. They are usually found on the wrist, more often on the dorsal side. Very rarely, these cysts can be located in the nerves, tendons, and bones (the intraneural, intratendinous, and bony ganglions, respectively). In this article, we report a case of a ganglion cyst localized in the extensor communis tendon of the index finger in a 54-year-old woman. The nature of the lesion was discovered intraoperatively; it was then resected. The postoperative course was uneventful and the patient recovered within 4 weeks. Histologic examination revealed that the cyst wall consisted of fibrous tissue with signs of degeneration and no epithelial lining.